only when they were told of the importance of time ____ wasting time is equal to wasting part of their life.
only when they were told of the importance of time ____ wasting time is equal to wasting part of their life.
A.did those boys realize
B.had those boys realized
why not
A.did those boys realize
B.had those boys realized
why not
英語人氣：763 ℃時間：2019-10-19 22:04:56
優(yōu)質(zhì)解答
b過去完成時,比過去更過去.when引導(dǎo)的從句是過去時,空后面主句的時態(tài)在從句發(fā)生后才發(fā)生.若選b,時間關(guān)系上就不對.如果這里把had改為have可以嗎？很不合適，only when 倒裝句型主句從句時態(tài)一致。
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